Question

在postgresql中 - 与表值参数（MSSQL）相同的存储过程是什么？

Answer 1

@HamidKhan - 您的开发语言是Java还是C＃？

CREATE TABLE public.employee (
  emp_id INTEGER NOT NULL,
  emp_nm VARCHAR(40),
  first_in_time TIMESTAMP WITH TIME ZONE DEFAULT clock_timestamp(),
  last_chg_time TIMESTAMP WITH TIME ZONE DEFAULT clock_timestamp(),
  CONSTRAINT employee_pkey PRIMARY KEY(emp_id)
)
WITH (oids = false);

CREATE TYPE public.employee_udt AS (
  emp_id INTEGER,
  emp_nm VARCHAR(40)
);

- c＃code 1

public class EmployeeUdt
{
    [PgName("emp_id")] 
    public int EmpId { get; set; } 

    [PgName("emp_nm")]
    public string EmpNm { get; set; }
}

- c＃code 2

List<EmployeeUdt> lst_param = new List<EmployeeUdt>();

for (int i = 0; i < this.dataGridView1.Rows.Count; i++)
{
lst_param.Add(
new EmployeeUdt
{
    EmpId = Convert.ToInt32(this.dataGridView1[0, i].Value),
    EmpNm = this.dataGridView1[1, i].Value.ToString()
}
);
}

var _param = new[] {
new NpgsqlParameter
{
    ParameterName="p_employee",
    NpgsqlDbType = NpgsqlDbType.Composite,
    SpecificType = typeof(EmployeeUdt[]),
    NpgsqlValue = lst_param
}

};

SqlHelper.ExecuteNonQuery<EmployeeUdt>(this.connstring, "usp_set_emp", _param);

Answer 2

PostgreSQL没有表变量。最相似的类型是composite array：

create type foo_typ as (a int, b int);

do $$
declare
  f foo_typ[];
  r foo_typ;
begin
  f := ARRAY(SELECT row(10, 20)::foo_typ from generate_series(1,10));
  for r in select * from unnest(f) g(v)
  loop
    raise notice 'a:%, b:%', r.a, r.b;
  end loop;
end;
$$;
NOTICE:  a:10, b:20
NOTICE:  a:10, b:20
NOTICE:  a:10, b:20
NOTICE:  a:10, b:20
NOTICE:  a:10, b:20
NOTICE:  a:10, b:20
NOTICE:  a:10, b:20
NOTICE:  a:10, b:20
NOTICE:  a:10, b:20
NOTICE:  a:10, b:20
DO

在PostgreSQL中编写存储过程，在语法熟悉度方面，你几乎从零开始来自T-SQL。 PostgreSQL语法类似于Oracle和DB2 - 但与SQL Server非常不同。

Answer 3

您可以将JSON数组用作jsonb_to_recordset（）的输入。这是我找到的最简单的方法。只需创建一个充满对象的JSON数组即可。我不确定它是否与SQL Server中的真实表值参数一样快，但仅需要一个请求即可插入或更新许多值。

这是我使用Dapper的代码库中的示例。注意如何将数组转换为JSON字符串。然后，它使用jsonb_to_recordset将其转换为表格。

await cnTeam.ExecuteAsync(@"
update enterprisecontact
set
primarysource_contactid = x.primarysource_contactid,
primarysource_contact_recordtype = x.primarysource_contact_recordtype,
primarysource_accountid = x.primarysource_accountid,
primarysource_accountname = x.primarysource_accountname,
primarysource_createdate = x.primarysource_createdate,
primarysource_updatedate = x.primarysource_updatedate
from (
    select * from jsonb_to_recordset(:jsoninput::jsonb) as y(
        emailaddress text, 
        primarysource_contactid text,
        primarysource_contact_recordtype text,
        primarysource_accountid text,
        primarysource_accountname text,
        primarysource_createdate timestamp with time zone,
        primarysource_updatedate timestamp with time zone
        )
) x
where enterprisecontact.emailaddress = x.emailaddress
", new { jsoninput = JsonConvert.SerializeObject(chunk) });

Postgresql中的表值参数等价

3 个答案: